We went to The Foam Source in Boulder for our mattress foam, and have to say it was a good thing we did. Fred Hermsen and his crew know everything about — and can do anything with — foam rubber. With their help we selected a high quality urethane foam (Qualux Q35, see their website for detailed descriptions of this and just about any other type of foam.) They were even happy to make covers for our odd shaped pieces. It is extremely comfortable, and we are very pleased with their quality and workmanship. Here is the rough sketch that I asked them to fabricate our mattress from. The Foam Source 2870 28th Street Boulder, CO 80301 (303) 444-4411 http://www.foamsource.com/